Will not start

my car shuts off for no reason sometimes it will start back up but today it did not. I change the sparks plug, alternator,and thermostat i don't know whats the problem now. I ask my brother and he said it could be coral pack i don't know if i am saying it right

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Have the charging system checked for proper operation. If battery is not being charged properly and goes weak the electronic control modules within the vehicle will start shutting down and cause all sorts of drivability issues

FUEL FILTER,,IF IT IS OLD-REPLACE!
FUEL PUMP NOT REALLY SUSPECT.....BUT POSSIBLE AS IN A THERMAL SHORTING (AFTER A SHORT TIME)
YOU HAVE TO DETERMINE WHETHER THIS DELAYED STALL ISSUE, IS COMING FROM A FUEL OR ELECTRICAL MALFUNCTION. IE: ELECTRIC CUT OUT...SUDDEN LOSS OF POWER...FUEL ISSUES: ROUGH RU..THEN SHUTS DOWNNING, BUCKING & SURGING
IF YOUR NOT FIXED...JEFF AT: JLGPROP@!YAHOO.COM THE WORX GROUP L.L.C.

Car
not starting or turning over indicates towards multiple possibilities. It can
be issue with battery or weak battery. But if battery checks out ok, then it
can be starter issue or faulty alternator or problem with low fuel pressure or
no spark at spark plugs due to dirty spark plugs or faulty ignition
coil or injectors getting cracked or dirty and needs to be cleaned.

Check the battery and the Alternator. Sometimes with these Saabs, when the alternator or the battery start to go bad, you will have many different symptoms all to do with just one issue. You can remove the battery and the alternator, take it to a parts store and they do free testing on those and they can tell you if either is bad or not. The Alternator needs to be out of the vehicle to be tested.

Check ASD Relay (Automatic Shut Down) Kills fuel and spark. Computer could be telling it to shut down, but usually Relay is bad. Key Switch could also be bad, get a good manual and a VOM (Volts, Ohms, Milliamps) meter, and make sure you have juice both coming in and going out, in the respective key positions. Jiggle wiring while testing, to check for loose connections